If you have allowed users to subscribe themselves to groups, you can use this wiki plugin to allow them to subscribe/unsubscribe to a list of groups. Please see PluginSubscribeGroup for a related plugin that allows a user to subscribe/unsubscribe to a single group.
Security and permissions
A user must have the perm tiki_p_subscribe_group to be able to see the box
To set this permission go to Settings > Groups
The group must be set as being a user choice To set this configuration go to Settings > Groups
Security Caution
Using this plugin, any registered user will be able to access any group provided that the group has "User Choice" checked in the settings for the group at Settings > Groups.
Parameters
Tiki Doc From Code error: subscribegroups not found
In the list of groups, you can see included groups in italics. You can not unsubscribe to an included group, if you are in the including group.
Example
This code:
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{subscribegroups groups="Cinergie:Editors" subscribe="Subscribe to a group"}